Carburetor for internal-combustion engines



I.- F. AND F. G. KING. CARBURETOR FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED 050.28, 1921.

1,426,570, v Patented Aug. 22, 1922 IIIHIIIIIIII I #7 w 4' QM/ LEwIs FRANK KING, OF POOLE, AND rnEnERIcK anon-en ENGLAND.

Kine, or rennnonouen,

GABBURETOR Eon. INTERNAL-COMBUSTION ENGINES.

Specification of letters Patent. Patgntgdt Aug, 22, 1922,

Application filed December 28, 1921. Serial No. 525,381. I

To all whom it may concern Be it known that we, LEwIs FRANK K NG, of No. 2 St. Marys Terrace, Longfieet, Poole, Dorset, and FREDERICK GEORGE .KING, of 5 Lynchford Road, Farnborough, S. Hants, England, both British subjects, have in vented certain new and useful Improvements in and Relating to Carburetors for Internal-Combustion Engines (for which we have filed application for patent in Great Britain #169727, dated November 26, 1920), of which thefollowing is a specification.

This invention relates to improvements in carburetors for internal combustion engines, of the kind in which the admission of air to the mixing chamber is controlled by a hollow piston valve connected to a fuel inlet valve. I

The object of the invention consists in an improved construction of carburetor ofthis kind and an improved arrangement of the air admission passages thereof. A further object of the invention consists in providing to function more steadily than hitherto.

Our invention is illustrated in the accompanying drawing in which Figure 1 is a central vertical section through the carburetor and Figure 2 is a transverse section taken just above the piston valve.

Referring to the drawing, a is a mixing chamber in the lower part of which a hollow piston 61 is provided. Air ports 7) are formed in the wall of this chamber and corresponding ports 6 (of which one pair only is shown in the drawing) are formed in the cylindrical wall of the piston cl through which air can be drawn into the interior of the said piston which also has ports p formed through one of its end walls opening into the interior of the said piston which also has ports 12 formed through one of its end walls opening into the mixing chamber a. The ports p can be opened to a variable extent by adjustment of a rotatable plate p having ports 39 therein which can be brought more or less into register with the ports 10 and when conveniently adjusted, can be secured in this position by a screw 10 passing through a circumferential slot 29* in the plate 3) and engaging a screw threaded hole in the top of the hollow piston valve d, or by any other suitable means. Additional ports f, f are provided in the cylindrical means whereby the piston valve is adapted wall of the piston 03 to allow air when the ports 6 and'c are opened, to escape from within the hollow piston (Z, through the said ports 7 and between the outside of, the pis-- ton and the interior wallof the chamber a into this chamber above the piston, so as to steady the, movement of' the piston, and

grooves or recesses a may be formed inthe chamber'wall in positions opposite to which the ports 7", fare brought when the ports Z), 6 areopened; I

The piston (Z issecured to the valve rod having'at 1ts upper end a valve it through which fuel canbe admitted to the chamber a from a fuel chamber In supplied, from any, suitable source under the control of 'a regu lating valve Z; A part. of the valve'rod j below the valve It is made tapered or stepped and passes through a tubular chamber 2' which is correspondingly tapered or stepped so that as the valve it opens the cross sectional area, of

the annularspace around the rod is gradu- 7' also has. a longitudinal passage formed through itto conduct air directly into the chamber 2'. I

When the ports 6, 6 are-fully open, a 001- lar g is brought against the end 0 of the tubular chamber 0, thus cutting off any further supply of fuel.

The rod j is acted upon by a spring 0, the tension of which can be adjusted, arranged to urge both the piston valve (2 and the fuel valve it towards their closed positions.

The chamber a is connected to the cylin-' v der of an internal combustion engine by a passage controlled by avalve 1'. In the operation of the carburetor, when the engine to which it'is connected isfrunning and the valve 1" is opened, the suction of the engine raises the piston (Z, the ports. f acting to steady its movement. At the same time the valve it is raised a corresponding height and admits the required quantity of fuel to the chamber 71 where it is atomized and min gled with the air entering through the ports a 2 t t 'What we claim as our invention and desire to secure by Letters Patent in United States of America is 1. A carburetor of the kind set forth, comprising a cylindrical casing having a mixing chamber and an outlet therefrom for atomized mixture, a fuel inlet fitting at the top of said casing above said mixing chamber, a hollow piston valve mounted to move axially within the lower portion of said casing, a rod fixed to said piston and extending through the bottom of said casing, a valve at the upper end of said rod controlling the fuel admission to said mixing chamber, ports in the walls of said casing co-opcrating with ports in the walls of the piston valve when said piston valve functions, and ports in the upper wall of said piston valve through which incoming air passes to the mixing chamber, for the purposes set forth.

2. A. carburetor of the kind set forth, comprising a cylindrical casing having a mixing chamber and an outlet therefrom for atomized mixture, a fuel inlet fitting at the top of said casing above said mixing chamher, a hollow piston valve mounted to move axially within said casing beneath said mixing chamber and attached to a rod extending through the bottom of said casing, a valve at the top of said rod adapted to control the fuel admission to said mixing chamber, ports in the walls of said casing adapted to co-operate with ports in the walls of the piston valve When the latter functions under engine suction, a spring normally tending to close said ports and cut off the supply of fuel to said mixing chamber, ports in the top of said piston valve through which. incoming air passes to the mixing chamber, and means for adjusting the area of said last mentioned ports, for the purposes set forth.

3. A carburetor of the kind set forth, comprising a cylindrical casing having a mixing chamber and an outlet for atomized mixture, a fuel inlet fitting at the top of said. casing above said mixing chamber, a hollow" piston valve adapted to move axially within said casing and beneath said mixing chamber, a rod fixed to said piston and extending at its loWer end through the bottom of said casing and carrying at its upper end a' valve controlling the fuel admission to said mixing chamber, ports in the walls of said casing co-operating with ports in the walls of the piston valve to admit air to themterior of said piston valve when the latter functions under engine suction, ports in the top of said piston valve through which incoming air passes to the mixing chamber, a perforated plate mounted on} said piston valvehaving ports therein adapted to register with the ports in said piston valve top, and means for securing said plate in any predetermined position to vary the area of the ports through which the air passes to said mixing chamber, for the purposes set forth.

In witness whereof we aflix our signatures.

LEWIS FRANK I KING.

FREDERICK GEORGE KING. 

